this study is focused on the biostratigraphy, sedimentary environments, facies distribution, and sequence stratigraphy of the coniacian–santonian sediments of tange-bulfaris section. five assemblage zones have been recognized by distribution of the foraminifera in the study area. assemblage zone 1(chara ostracods zone) is coniacian in age and occurs in the lower part of the succession. assembla...

The characterization of Mg-clays in rock samples (well P1) from the Barra Velha Formation (Early Cretaceous) allowed establishment mineral assemblages on basis their kerolite and Mg-smectite (stevensite saponite) content. Kerolite-rich (A B) rarely contain saponite. Assemblage B is composed kerolite-stevensite mixed layers, while assemblage A consists more than 95% kerolite. Mg-smectite-rich (C...

Proterozoic limestone in a north British terrane contains newly recognised occurrence of Nb-REE minerals. The mineralized Loch Shin Limestone is the Lewisian Complex Northern Highlands Scotland, intruded by alkaline plutons above Caledonian (∼0.43 Ga) subduction zone. mineral assemblage includes columbite, calcium niobate minerals, and niobian rutile also W- Sn-bearing phases. interval between ...

The chemical characterisation of archaeological glass allows the discrimination between different glass groups and the identification of raw materials and technological traditions of their production. Several lines of evidence point towards the large-scale production of first millennium CE glass in a limited number of glass making factories from a mixture of Egyptian mineral soda and a locally ...

[1] One process for the formation of continental crust is the accretion of arc terranes at continental margins. A longstanding problem with this model is that although the composition of the continental crust is andesitic, the majority of arc lavas are basaltic. Moreover, those arc lavas that are andesitic tend to be evolved (lower Mg #) compared to the continental crust. Continental crust can ...

We compared the assemblages of phyllostomid bats in three Neotropical rainforests with respect to species richness and assemblage structure and suggested a method to validate estimates of species richness for Neotropical bat assemblages based on mist-netting data. The fully inventoried bat assemblage at La Selva Biological Station (LS, 100 m elevation) in Costa Rica was used as a reference site...

A Mississippian miospore assemblage has been recorded from well A in the Persian Gulf in Iranian offshore, for the first time. Fifteen species of spores have been recognized in the Early Carboniferous assemblage of this well which the most important of them are: Spelaeotriletes arenaceus, Aratrisporites saharaensis, Spelaeotriletes balteatus, Spelaeotriletes triangulus and Radiizonates arcuatus...

This experimental study examines the mineral/ melt partitioning of incompatible trace elements among high-Ca clinopyroxene, garnet, and hydrous silicate melt at upper mantle pressure and temperature conditions. Experiments were performed at pressures of 1.2 and 1.6 GPa and temperatures of 1,185 to 1,370 C. Experimentally produced silicate melts contain up to 6.3 wt% dissolved H2O, and are satur...

Empirical studies of zircon in migmatites document features compatible with growth during heating at suprasolidus conditions. However, numerical modelling behaviour suggests that is expected to grow only cooling and melt crystallization. Here, phase equilibrium coupled mineral–melt Zr partitioning used an attempt reconcile the observations from predictions previous models anatectic systems. In ...

The Precambrian iron formation is related to the evolution of earth's environment and an important record ancient ocean, atmospheric conditions. Wuzhiling Formation at Songshan boundary one newly identified granular formations (GIF). Through study mineral characteristics morphology in Formation, it found that its material source may be hydrothermal fluid; original sediments hematite particles '...